Resolve No validation Email in Store->Configurations->Sales->Sales Emails (issue 24137)

Author: edenduong

app/code/Magento/Sales/etc/adminhtml/system.xml

@@ -183,6 +183,7 @@
                 <field id="copy_to" translate="label comment" type="text" sortOrder="4" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Send Order Email Copy To</label>
                     <comment>Comma-separated</comment>
+                    <validate>validate-emails</validate>
                 </field>
                 <field id="copy_method" translate="label" type="select" sortOrder="5" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Send Order Email Copy Method</label>
@@ -241,6 +242,7 @@
                 <field id="copy_to" translate="label comment" type="text" sortOrder="4" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Send Invoice Email Copy To</label>
                     <comment>Comma-separated</comment>
+                    <validate>validate-emails</validate>
                 </field>
                 <field id="copy_method" translate="label" type="select" sortOrder="5" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Send Invoice Email Copy Method</label>
@@ -270,6 +272,7 @@
                 <field id="copy_to" translate="label comment" type="text" sortOrder="4" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Send Invoice Comment Email Copy To</label>
                     <comment>Comma-separated</comment>
+                    <validate>validate-emails</validate>
                 </field>
                 <field id="copy_method" translate="label" type="select" sortOrder="5" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Send Invoice Comments Email Copy Method</label>
@@ -299,6 +302,7 @@
                 <field id="copy_to" translate="label comment" type="text" sortOrder="4" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Send Shipment Email Copy To</label>
                     <comment>Comma-separated</comment>
+                    <validate>validate-emails</validate>
                 </field>
                 <field id="copy_method" translate="label" type="select" sortOrder="5" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Send Shipment Email Copy Method</label>
@@ -328,6 +332,7 @@
                 <field id="copy_to" translate="label comment" type="text" sortOrder="4" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Send Shipment Comment Email Copy To</label>
                     <comment>Comma-separated</comment>
+                    <validate>validate-emails</validate>
                 </field>
                 <field id="copy_method" translate="label" type="select" sortOrder="5" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Send Shipment Comments Email Copy Method</label>
@@ -357,6 +362,7 @@
                 <field id="copy_to" translate="label comment" type="text" sortOrder="4" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Send Credit Memo Email Copy To</label>
                     <comment>Comma-separated</comment>
+                    <validate>validate-emails</validate>
                 </field>
                 <field id="copy_method" translate="label" type="select" sortOrder="5" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Send Credit Memo Email Copy Method</label>
@@ -386,6 +392,7 @@
                 <field id="copy_to" translate="label comment" type="text" sortOrder="4" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Send Credit Memo Comment Email Copy To</label>
                     <comment>Comma-separated</comment>
+                    <validate>validate-emails</validate>
                 </field>
                 <field id="copy_method" translate="label" type="select" sortOrder="5" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Send Credit Memo Comments Email Copy Method</label>